howdy James, and welcome to the garage! we do like pictures, so you're invited to get some into the editor for the gallery, or link some in here so we can see!
we tend to value safety here, so while it may not be 'necessary' to box the frame, I'll say you'd be more likely to live long and prosper if you listen to the opinions of those that tell ya it's a good thing - remember that for starters, you've messed w/ the original frame design by putting in that M2, and you'll be wanting that old thing to handle that improved agility while being pushed around by 2 or 3 or 4 times as much torque
so add at least one more check to the yes side!
Bill